The American version of the film, which I don't know if it goes back to the novel or is a remake of the ealier (by not very long) version, has a soundtrack by Trent Reznor and Atticus Ross, and like The Social Network which they worked on previously there's a free six track sampler available. Given that the full soundtrack is three CDs, it's not surprising that the sampler is over half and hour long.
And it's very good film music, there's very little in the way of "songs", it's atmospheric electronica to work with enhance the scene rather than lead it.